Dinosaur Electronics Accessory Delay Relay

Dinosaur Electronics Accessory Delay Relays for RV Furnaces

When an RV furnace cycles on or off, the blower fan needs carefully timed control to protect both the heat exchanger and the motor itself. That's exactly the problem Dinosaur Electronics engineered its accessory delay relay to solve. The company has long been regarded as a go-to source for RV appliance electronics — producing replacement ignitor boards, control boards, and timing components that meet or exceed the performance of original equipment parts.

The TDR: Precision Timing in a Compact Package

Dinosaur Electronics' flagship accessory delay relay is the TDR (Time Delay Relay), part number 12VDCTDR. Designed specifically for older RV furnaces that rely on a standard 12VDC ignitor board, the TDR brings modern microcontroller technology to a classic application.

• 12V DC operation — matches the onboard electrical systems found in nearly all RVs, travel trailers, and campers
• Microcontrolled design — precise, repeatable timing that solid-state electronics deliver far more reliably than aging mechanical relays
• 4-second power-on delay — the TDR waits 4 seconds before applying power to the fan motor , giving the burner time to establish a flame before airflow begins
• 2-minute cooldown cycle — a 2-minute cooldown period at the end of the heating cycle keeps the blower running long enough to purge residual heat from the heat exchanger, protecting both the furnace and the living space
• Compact footprint — the unit measures just 1‑1/2" x 1‑1/2" , making installation straightforward even in tight furnace cabinets

Broad Furnace Compatibility

The TDR is a replacement relay for use in older furnaces that use a standard 12VDC ignitor board. This covers a wide range of brand-name RV furnaces commonly found in older coaches and trailers. Dinosaur Electronics also provides detailed modification instructions for owners working with DuoTherm® 900/9000 series furnaces or any furnace where the thermostat is in the ground circuit , ensuring that even less-common installations can be properly supported.

Why Dinosaur Electronics Stands Out in This Category

Dinosaur Electronics has built its reputation on delivering reliable, drop-in replacements for RV appliance components that are no longer available from original manufacturers or are cost-prohibitive to source. Their accessory delay relays reflect that same philosophy: a precisely engineered, microcontrolled solution that restores proper furnace operation without the guesswork of adapting a generic relay. For RV owners and technicians who rely on consistent heat cycle performance, the Dinosaur Electronics TDR is a trusted, purpose-built answer to a very specific problem.

Browse the full Dinosaur Electronics brand catalog to explore their complete lineup of RV ignitor boards, control boards, and replacement electronics, or shop all accessory delay relays to compare options across brands.